How badly do you have to do to get a fail in a module???

So I'm a second year philosophy student at LSE. I just finished my last exam. My other ones had not gone great and I haven't enjoyed this year at all. But my last exam was just an absolute shocker.

The exam was worth 67% of the whole grade. In my coursework I got a 65, which made up the rest of the grade.

I guess my question is... how bad do yo uhave of have done in a qualititative essay based subject in order to have failed at LSE? I don't think my essays were amazing last year but I still got a high 2:1... this year it's been far worse for me and that exam was the worst I've ever sat. But how easy is it to actually fail an exam in a subject like philosophy.

I know this own't be one of the modules I get a 2:1 in so I'm really only bothered aobut passing it...

Which modules did you do? I have to pick 2 philosophy modules for second year and just want to go for the ones easiest to get a 2:1 in.